MB1502

3

PIN DESCRIPTION

Pin

No.

Pin

Name

I/O

Description

1

2

I

O

Oscillator input.

Oscillator output.

3

—

Power supply input for charge pump and analog switch.

4

—

Power supply voltage input.

5

O

Charge pump output.

The characteristics of charge pump is reversed depending upon FC input.

6

GND

—

Ground

7

LD

O

Phase comparator output.

pin outputs low level.

8

l

Prescaler input.

The connection with an external VCO should be AC connection.

9

Clock

I

Clock input for 19-bit shift register and 16-bit shift register.

On rising edge of the clock shifts one bit of data into the shift registers.

10

Data

l

Binary serial data input.

The last bit of the data is a control bit which specified destination of shift registers.

When this bit is high level and LE is high level, the data stored in shift register is transferred to 15-bit latch.

When this bit is low level and LE is high level, the data is transferred to 18-bit latch.

11

LE

I

Load enable input (with internal pull up resistor).

When LE is high or open, the data stored in shift register is transferred into latch depending upon the control

bit. At the time, internal charge pump output to be connected to BISW pin because internal analog switch

becomes ON state.

12

FC

l

Phase select input of phase comparator (with internal pull up resistor).

When FC is low level, the characteristics of charge pump, phase comparator is reversed.

13

BISW

O

Analog switch output.

Usually BISW pin is set high-impedance state. When internal analog switch is ON (LE pin is high level), this

pin outputs internal charge pump state.

14

O

Monitor pin of phase comparator input.

depending upon FC pin input level.

15

16

∅P

∅R

O

O

Outputs for external charge pump.

The characteristics are reversed according to FC input.

∅P pin is N-channel open drain output.